The Atlantic Yards project is causing a lot of sleepless nights for Prospect Heights neighbors.

All night jackhammering for utility work to prepare for the new Nets arena - expected to open in September- has residents on Dean St. near 5th Ave. ready to crack, they said.

And on the other side of the project site, the state last week authorized developer Bruce Ratner to work until 3 a.m. on rebuilding the Carlton Ave. Bridge, which he is scrambling to get done in time for the arena opening.

“It’s horrible,” said Gary Wiebke, 52, who lives on Dean St. “The noise levels are astounding. Our building shimmies, it shakes.”

Residents said the work on the electrical upgrades goes on until 6 a.m. - and about an hour later, construction work on the arena starts.